Top definition
Inter-gultial sex, that is, when a man places his penis between the bottox, but not into the anus, of his partner and stimulates himself to orgasm. Like a Hawian Muscle Rub only "down under."
"She was too up-tight to Saddleback, so I settled for an Australian Muscle Rub."
by Parvus June 27, 2009
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